Daily Sunspot Evaluation
Observation Sheet Thursday, 7 April 1983
There is no typed record for this day. The values below were read by computer from the table on the sheet; when in doubt, see the drawing. Details →
- Number of groups (g)
- 5
- Number of spots (f)
- 29
- Relative number (R)
- 79
- Observer
- HM
- Reading
- all checks consistent
- File
- 19830407.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HSX – 1 | -15 | 75W | 125 | 77 | 1.5 | 74 |
| 2 | AXX – 2 | -7 | 26W | 76 | 28W | 83 | |
| 3 | DAI – 16 | -11 | 11E | 39 | 09E | 8.5 | 82 |
| 4 | DAI – 9 | -16 | 54E | 356 | 52E | 55 | 84 |
| 5 | HSX – 1 | -9 | 70E | 340 | 68E | 1.5 | 85 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.